Threat Intelligencewith Open Source tools

Cornerstones of Trust 2014

@jaimeblasco@santiagobassett

Presenters

JAIME BLASCODirector AlienVault Labs

Security Researcher Malware Analyst

Incident Response

SANTIAGO BASSETTSecurity Engineer

OSSIM / OSSECNetwork Security

Logs Management

The attacker’s advantage

• They only need to be successful once

• Determined, skilled and often funded adversaries

• Custom malware, 0days, multiple attack vectors, social engineering

• Persistent

The defender’s disadvantage

• They can’t make a mistake• Understaffed, jack of all trades, underfunded• Increasing complex IT infrastructure:– Moving to the cloud– Virtualization– Bring your own device

• Prevention controls fail to block everything• Hundreds of systems and vulnerabilities to

patch

What is Threat Intelligence?

• Information about malicious actors

• Helps you make better decisions about defense

• Examples: IP addresses, Domains, URL’s, File Hashes, TTP’s, victim’s industries, countries..

State of the art

• Most sharing is unstructured & human-to-human

• Closed groups

• Actual standards require knowledge, resources and time to integrate the data

How to use Threat Intelligence

• Detect what my prevention technologies fail to block

• Security planning, threat assessment

• Improves incident response / Triage

• Decide which vulnerabilities should I patch first

The Threat Intelligence Pyramid of Pain

Standards & Tools

• IODEF: Incident Object Description Exchange Format

• MITRE:– STIX: Structured Threat Information eXpression– TAXXII: Trusted Automated eXchange of Indicator

Information – MAEC, CAPEC, CyBOX

• CIF: Collective Intelligence Framework

Collective Intelligence Framework

Collecting malwareSome malware tracking sites:• http://malc0de.com/rss• http://www.malwareblacklist.com/mbl.xml• http://www.malwaredomainlist.com/hostslist/mdl.xml• http://vxvault.siri-urz.net/URL_List.php• http://urlquery.net• http://support.clean-mx.de/clean-mx/xmlviruses.php

Some Open Source malware crawlers:• Maltrieve: https://github.com/technoskald/maltrieve• Ragpicker: https://code.google.com/p/malware-crawler/

Collecting malware

Other malware collection tools

Dionaea honeypot: • http://dionaea.carnivore.it/

Thug Honeyclient – Drive by download attacks:• https://github.com/buffer/thug • Emulates browsers functionality (activeX

controls and plugins)

Analyzing malware

Yara: Flexible, human-readable rules for identifying malicious streams.

Can be used to analyze:• files• memory (volatility)• network streams.

private rule APT1_RARSilent_EXE_PDF { meta: author = "AlienVault Labs" info = "CommentCrew-threat-apt1"

strings: $winrar1 = "WINRAR.SFX" wide ascii $winrar2 = ";The comment below contains SFX script commands" wide ascii $winrar3 = "Silent=1" wide ascii

$str1 = /Setup=[\s\w\"]+\.(exe|pdf|doc)/ $str2 = "Steup=\"" wide ascii condition: all of ($winrar*) and 1 of ($str*)}

Analyzing malware

Cuckoo Sandbox: Used for automated malware analysis.

• Traces Win32 API calls• Files created, deleted and downloaded• Memory dumps of malicious processes• Network traffic pcaps

Analyzing malware

Sandbox – CIF integration

In our example: hxxp://www.garyhart.com, domain

CIF External feed example

Thank you!!@jaimeblascob

@santiagobassett